head to head
Neither is simply harder - they are hard in different places. Call of Duty: Black Ops demands more variance; JoJo's Bizarre Adventure: All-Star Battle R demands more reads.

Execution · Competitive PvP
Cold War-era shooter pairing twitch multiplayer with the cult Zombies mode.

Reads · Competitive PvP
An anime fighting game packing JoJo's whole cast into stylish one-on-one duels.
Call of Duty: Black Ops leans Execution (Competitive PvP); JoJo's Bizarre Adventure: All-Star Battle R leans Reads (Competitive PvP).
Call of Duty: Black Ops leans a little harder on execution, though the gap is small.
Call of Duty: Black Ops
Gunfights hinge on aim and reaction speed
JoJo's Bizarre Adventure: All-Star Battle R
Combo execution and punish timing matter
JoJo's Bizarre Adventure: All-Star Battle R leans clearly harder on reads.
Call of Duty: Black Ops
Reading human opponents' positioning and timing
JoJo's Bizarre Adventure: All-Star Battle R
Human opponents adapt every round, classic fighter mind games
Call of Duty: Black Ops leans clearly harder on variance.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
JoJo's Bizarre Adventure: All-Star Battle R
Full information once matchups are known
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Black Ops
Class builds, map control, zombies routing
JoJo's Bizarre Adventure: All-Star Battle R
Frame data, matchup knowledge, optimal punishes
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.